Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 7
Articles | Volume 26, issue 7
https://doi.org/10.5194/acp-26-4917-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-4917-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 7
Research article
 | 
14 Apr 2026
Research article |  | 14 Apr 2026

Novel insights on causes of disproportionate trends between particulate NO3− and NOx emissions in Canadian urban atmospheres

Qinchu Fan, Xiaohong Yao, and Leiming Zhang

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Short summary
This study finds that the disproportionate multi-decadal trends between particulate nitrate and NOx emissions in Canadian urban atmospheres are driven by reductions in primary fine-fraction nitrate emissions, localized dispersion processes, and wind anomalies modulated by the Arctic Oscillation. These results help explain the weak or absent response of fine-fraction nitrate to NOx emission reductions observed globally, particularly in cold-climate regions.
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